We do know that the three Fox debate moderators held many planning meeting and spent much time formulating their questions. Megyn bragged and gloated about that many times on her shows before the debate. Chris Wallace tapped on his notebook said he has some "doozies" in there. Even Bret Baier made some remarks.
Those three were all singing the same song on-the-air days before the debate. I guess we don't know if anyone above approved the questions, or if they had authority to decide on their own.
All I know is Hugh Hewitt sounded as if he had undergone the full Clockwork Orange treatment before he interviewed Trump on his show last night.